Microchip Technology 93AA86AT-I/SN

Overview

93AA86AT-I/SN from Microchip Technology is a 16 Kbit (2048 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 1.8–5.5 V supply range, industrial temperature rating (–40°C to +85°C), and Pb-free SOIC-8 package. It delivers nonvolatile storage for configuration data in embedded controllers, sensor calibration registers, and power management systems.

For engineers reviewing the 93AA86AT-I/SN datasheet, 93AA86AT-I/SN pinout, 93AA86AT-I/SN application, or 93AA86AT-I/SN equivalent, key selection criteria include its 8-bit fixed organization, absence of ORG/PE pins, 1 million erase/write cycles, 200-year data retention, and compatibility with legacy Microwire host controllers requiring CS/CLK/DI/DO timing compliance.

Technical Context

This device implements a synchronous serial interface with chip-select–gated clocking, self-timed erase/write cycles (5 ms typical), and automatic ERAL before WRAL. It uses a dedicated 8-bit memory map with no word-size configuration logic - unlike 'C' variants - and relies on external host control for instruction sequencing (READ, WRITE, ERASE, EWEN/EWDS).

Power-on data protection is enforced via internal voltage detection (VPOR = 1.5 V), and Ready/Busy status is signaled via DO pin polling during programming. Standby current is ≤1 µA at VCC = 2.5–5.5 V with CLK/CS low and DI driven.

Key Specifications

Pinout & Package

8-pin SOIC package (SN suffix), body dimensions 3.9 mm × 4.9 mm × 1.75 mm, standard JEDEC MS-012AC footprint, matte tin (Pb-free) finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 93LC86AT-I/SN, the 93AA86AT-I/SN supports lower voltage operation (1.8 V), enabling direct integration into 1.8 V microcontroller domains; compared with AT25020B-MAHL-T, it preserves legacy Microwire timing and instruction set but trades off higher speed for broader voltage flexibility.

Availability

93AA86AT-I/SN is available at Aetrix Electronics and suitable for motor control configuration, smart sensor calibration, and industrial PLC I/O modules requiring stable component supply across extended product lifecycles.

Supply support for 93AA86AT-I/SN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The 93XX series EEPROMs were designed specifically for reliable, low-power nonvolatile storage in cost-sensitive industrial and automotive subsystems where Microwire compatibility and long-term data integrity are mandatory.

FAQ

What is the memory organization of the 93AA86AT-I/SN?

The 93AA86AT-I/SN has a fixed 2048 × 8-bit (16 Kbit) organization. Unlike 'C' variants, it lacks an ORG pin and does not support 16-bit word access - all reads and writes operate on byte-aligned addresses with 8-bit data transfers.

Does the 93AA86AT-I/SN support 1.8 V operation?

Yes, the 93AA86AT-I/SN operates across 1.8 V to 5.5 V. Its VPOR threshold is 1.5 V, ensuring robust power-on data protection even during shallow brown-outs in 1.8 V systems - a key differentiator from 93LC86A/B/C variants.

Is the 93AA86AT-I/SN pin-compatible with other 93XX86 devices in SOIC-8?

Yes - the 93AA86AT-I/SN shares identical SOIC-8 pinout (CS/CLK/DI/DO/VSS/NC/NC/VCC) with all 93XX86A/B/C variants in SN package. However, ORG and PE pins are No Connect on 'A' and 'B' versions, making them functionally and physically compatible in layouts designed for 'C' parts.

How is write protection implemented on the 93AA86AT-I/SN?

The 93AA86AT-I/SN uses software-controlled write protection: the EWEN instruction must precede any ERASE or WRITE command, and EWDS disables further writes until next power cycle or explicit EWEN. There is no hardware write-protect pin (PE is absent on 'A' versions).

What is the maximum clock frequency supported by the 93AA86AT-I/SN?

The 93AA86AT-I/SN supports up to 3 MHz clock frequency when VCC ≥4.5 V. At 1.8–2.5 V, maximum clock rate drops to 1 MHz - a trade-off for ultra-low-voltage operation that must be accounted for in timing-critical firmware.